Patent US3604813A successfully refreshed from Google Patents.
US3604813A
Expired / Lapsed
US
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Position-indicating instrument
Assignee: Individual
•
Filing: 1969-11-25
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Granted: 1971-09-14
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Expires: 1989-11-25
Abstract
Abstract Moire instrument enabling a distant observer to locate a point into an optical plane of reference established by the instrument. The instrument has two line grids positioned in intersecting planes. For good visibility of the moire patterns certain specific conditions concerning the pitch of the grids and their separation have to be met. In order to maintain a sufficient working range, the pitch of the foremost grid may be made slightly larger than that of the rearmost grid.
Inventors
- 👤 Gerrit Hendrik Te Kronnie
- 👤 Karel Hero Volkers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:38
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/36; G01D5/38
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
131 words
Instrument for rendering to a distant observer a visual indication of the position of a point relative to a plane of reference established by the instrument, which instrument comprises two line grids positioned in intersecting planes perpendicular to the plane of reference, which grids are symmetrical with respect to the plane of reference and both have lines which are substantially parallel to the plane of reference, characterized in that the pitch of the line grids is so selected and the grids are so positioned relative to each other that the condition: is satisfied, in which: dmax the maximum distance between the grids taken in the direction perpendicular to the bisector plane of the grids; s the pitch of the grids; and lambda m the mean wave length of the light used.
Claim 2
Dependent Claim
131 words
Instrument for rendering to a distant observer a visual indication of the position of a point relative to a plane of reference established by the instrument, which instrument comprises two line grids positioned in intersecting planes perpendicular to the plane of reference, which grids are symmetrical with respect to the plane of reference and both have lines which are substantially parallel to the plane of reference, characterized in that the pitch of the line grids is so selected and the grids are so positioned relative to each other that the condition: is satisfied, in which: dmax the maximum distance between the grids taken in the direction perpendicular to the bisector plane of the grids; s the pitch of the grids; and lambda m the mean wave length of the light used.
Claim 3
Dependent Claim
23 words
Instrument as claimed in claim 1, wherein the pitch of the foremost grid is made slightly greater than that of the rearmost grid.
Claim 4
Dependent Claim
26 words
Instrument as claimed in claim 2, wherein the difference in pitch is between 1/2000 and 1/100 of the average value of the pitches of the grids.
Claim 5
Dependent Claim
33 words
Instrument as claimed in claim 2, wherein the grids are so positioned that there is no phase shift or a phase shift of a half period at the place of the reference plane.
Claim 6
Dependent Claim
43 words
Instrument as claimed in claim 2, wherein one or both of the grids have a pitch which varies in the direction of the grid lines, such that at a predetermined observation distance the moire bars have a substantially constant width through their length.
Claim 7
Dependent Claim
148 words
Instrument for rendering to a distant observer a visual indication of the position of a point relative to a plane of reference established by the instrument, which instrument comprises two line grids positioned in intersecting planes perpendicular to the plane of reference, which grids are symmetrical with respect to the plane of reference and both have lines which are substantially parallel to the plane of reference, characterized in that the pitch of the line grids is so selected and the grids are so positioned relative to each other that the condition: is satisfied, in which: dmax the maximum distance between the grids taken in the direction perpendicular to the bisector plane of the grids; dmin the minimum distance between the grids taken in the same direction; n an integer, greater than zero; s the pitch of the grids; and lambda m the mean wavelength of the light used.
Claim 8
Dependent Claim
148 words
Instrument for rendering to a distant observer a visual indication of the position of a point relative to a plane of reference established by the instrument, which instrument comprises two line grids positioned in intersecting planes perpendicular to the plane of reference, which grids are symmetrical with respect to the plane of reference and both have lines which are substantially parallel to the plane of reference, characterized in that the pitch of the line grids is so selected and the grids are so positioned relative to each other that the condition: is satisfied, in which: dmax the maximum distance between the grids taken in the direction perpendicular to the bisector plane of the grids; dmin the minimum distance between the grids taken in the same direction; n an integer, greater than zero; s the pitch of the grids; and lambda m the mean wavelength of the light used.
Claim 9
Dependent Claim
130 words
Instrument for rendering to a distant observer a visual indication of the position of a point relative to a plane of reference established by the instrument, which instrument comprises two line grids positioned in intersecting planes perpendicular to the plane of reference, which grids are symmetrical with respect to the plane of reference and both have lines which are substantially parallel to the plane of reference, characterized in that the pitch of the line grids is so selected and the grids are so positioned relative to each other that the condition: is satisfied, in which: dm the average distance between the grids taken in the direction perpendicular to the bisector plane of the grids; s the pitch of the grids; and lambda m the mean wavelength of the light used.
Claim 10
Dependent Claim
130 words
Instrument for rendering to a distant observer a visual indication of the position of a point relative to a plane of reference established by the instrument, which instrument comprises two line grids positioned in intersecting planes perpendicular to the plane of reference, which grids are symmetrical with respect to the plane of reference and both have lines which are substantially parallel to the plane of reference, characterized in that the pitch of the line grids is so selected and the grids are so positioned relative to each other that the condition: is satisfied, in which: dm the average distance between the grids taken in the direction perpendicular to the bisector plane of the grids; s the pitch of the grids; and lambda m the mean wavelength of the light used.
Claim 11
Dependent Claim
136 words
Instrument for rendering to a distant observer a visual indication of the position of a point relative to a plane of reference established by the instrument, which instrument comprises two line grids positioned in intersecting planes perpendicular to the plane of reference, which grids are symmetrical with respect to the plane of reference and both have lines which are substantially parallel to the plane of reference, characterized in that the pitch of the line grids is so selected and the grids are so positioned relative to each other that the condition: is satisfied in which: dm the average distance between the grids measured in the direction perpendicular to the bisector plane of the grids; n an integer, greater than zero; s the pitch of the grids; and lambda m the mean wavelength of the light used.
Claim 12
Dependent Claim
136 words
Instrument for rendering to a distant observer a visual indication of the position of a point relative to a plane of reference established by the instrument, which instrument comprises two line grids positioned in intersecting planes perpendicular to the plane of reference, which grids are symmetrical with respect to the plane of reference and both have lines which are substantially parallel to the plane of reference, characterized in that the pitch of the line grids is so selected and the grids are so positioned relative to each other that the condition: is satisfied in which: dm the average distance between the grids measured in the direction perpendicular to the bisector plane of the grids; n an integer, greater than zero; s the pitch of the grids; and lambda m the mean wavelength of the light used.
Claim 13
Dependent Claim
23 words
Instrument as claimed in claim 6, wherein the pitch of the foremost grid is made slightly greater than that of the rearmost grid.
Claim 14
Dependent Claim
26 words
Instrument as claimed in claim 9, wherein the difference in pitch is between 1/2000 and 1/100 of the average value of the pitches of the grids.
Claim 15
Dependent Claim
33 words
Instrument as claimed in claim 9, wherein the grids are so positioned that there is no phase shift or a phase shift of a half period at the place of the reference plane.
Claim 16
Dependent Claim
43 words
Instrument as claimed in claim 9, wherein one or both of the grids have a patch which varies in the direction of the grid lines, such that at a predetermined observation distance the moire bars have a substantially constant width through their length.
References Cited (Backward Citations)
US2390122A
Cited
US2451972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |